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using System.Threading.Tasks;
using System.IO.IsolatedStorage;

namespace FamilyNotes
{
    /// <summary>
    /// Provides an extension method to deltree a directory
    /// </summary>
    public static class Utils
    {
        /// <summary>
        /// Extension method to delete a directory.
        /// 
        /// The WinRT function DeleteDirectory() can only do so if the directory is empty.
        /// This function deletes a directory and all of its contents including subdirectories.
        /// </summary>
        /// <param name="appLocalDataStorage">The isolated storage for the app</param>
        /// <param name="path">The directory to delete</param>
        /// <returns></returns>
        public async static Task<bool> DeleteDirectoryAsync(this IsolatedStorageFile appLocalDataStorage, string path)
        {
            if (!appLocalDataStorage.DirectoryExists(path))
            {
                return false;
            }

            // Recursively delete subdirectories
            foreach (string subdirectory in appLocalDataStorage.GetDirectoryNames($"{path}\\*.*"))
            {
                await DeleteDirectoryAsync(appLocalDataStorage, $@"{path}\{subdirectory}");
            }

            // Delete all of the files in this directory
            foreach (var file in appLocalDataStorage.GetFileNames($@"{path}\*.*"))
            {
                appLocalDataStorage.DeleteFile($@"{path}\{file}");
            }

            // The directory we were asked to delete is now empty. Delete it.
            appLocalDataStorage.DeleteDirectory(path);
            return true;
        }
    }
}
